| Land Assist Homes Limited | Real estate | 2020 |
| Land Experts Group Ltd | Construction | 2015 |
| Land of Laura Ltd | Wholesale & retail | 2026 |
| Landells Flat Management Company Limited | Households | 1981 |
| Landlordpedia Ltd | Real estate | 2025 |
| Landmark Aviation (UK) Limited | Financial services | 2014 |
| Landmark Construction Group Ltd | Construction | 2018 |
| Landmark Drives & Patios Limited | Administrative & support | 2012 |
| Landmark Driving School Ltd | Education | 2025 |
| Landmark Houses Ltd | Real estate | 2025 |
| Landmark Property Bedfordshire Ltd | Real estate | 2024 |
| Landsdown Holdings Limited | Hospitality | 2021 |
| Landstat Estate Holding Limited | Financial services | 2022 |
| Landstat Z Ltd | Real estate | 2022 |
| Landt Consultancy Group Ltd | Information & communication | 2024 |
| Langley GRP Ltd | Financial services | 2025 |
| Language Solution Hub Limited | Professional & scientific | 2025 |
| Lanie Ltd | Wholesale & retail | 2026 |
| Lanre’S Catering Service Ltd | Hospitality | 2026 |
| Lansdowne Oak Ltd | Other services | 2022 |
| Lantiz Concept Limited | Construction | 2016 |
| LAP Contracts and Construction Management Limited | Construction | 2021 |
| Lapcom Limited | Other services | 2024 |
| Laporta Design Limited | Professional & scientific | 2002 |
| Laporta Holdings Limited | Financial services | 2008 |
| Laptop City Limited | Extraterritorial | 2008 |
| Lapz Ltd | Wholesale & retail | 2024 |
| Laqo Ltd | Construction | 2010 |
| Laque Beauty Limited | Other services | 2025 |
| Laragh Property Management Services Ltd | Real estate | 2016 |
| Larchdale Investments Limited | Real estate | 2010 |
| Larry G Limited | Transport & logistics | 2017 |
| Larry-Kab Global Limited | Wholesale & retail | 2025 |
| Lartista (Luton) Ltd | Hospitality | 2022 |
| LAS Investments Limited | Real estate | 2025 |
| Lasa Construction Limited | Construction | 2025 |
| Lasani Trans Ltd | Transport & logistics | 2023 |
| Lasersound Limited | Arts & recreation | 2010 |
| Lash Station 1 Ltd | Other services | 2020 |
| Laslau Ltd | Transport & logistics | 2023 |
| Lasnek Limited | Manufacturing | 2002 |
| Lassad Care Services Limited | Health & social care | 2020 |
| Last Mile Compliance Consultancy Solutions Limited | Professional & scientific | 2025 |
| Last Minute Call Ltd | Construction | 2022 |
| LAT Galaxy Limited | Transport & logistics | 2016 |
| Latherandxfoliate Ltd | Wholesale & retail | 2024 |
| Latif Property Holdings Ltd | Real estate | 2026 |
| Latitude Fifty One Estate Management Limited | Real estate | 2025 |
| Lauleen’S Celebrations Boutique Limited | Wholesale & retail | 2024 |
| LAUNCH90 Ltd | Information & communication | 2025 |
| Laundary @ Your Door Step Ltd | Other services | 2019 |
| Laur&Craiova Ltd | Wholesale & retail | 2025 |
| Laura Cleaning Ltd | Administrative & support | 2021 |
| Laura Special Services Limited | Transport & logistics | 2022 |
| Laurdan Building Limited | Construction | 2015 |
| Lauren's Tooth Hygiene Ltd | Health & social care | 2023 |
| LAV Services Limited | Health & social care | 2014 |
| Lavender Consultants Limited | Professional & scientific | 1997 |
| Lavendon Aylesbury Limited | Hospitality | 2022 |
| Lavirian Ltd | Transport & logistics | 2024 |
| Lavish Luxxe Limited | Wholesale & retail | 2023 |
| Lavoro Limited | Professional & scientific | 2011 |
| Lavrock Limited | Construction | 2013 |
| Law Articles Ltd | Information & communication | 2025 |
| Lawes Measured Surveys Limited | Construction | 2021 |
| Lawmentorit Ltd | Education | 2023 |
| Lawrence Foundations Ltd | Real estate | 2021 |
| Lawrence of Luton Ltd | Construction | 2026 |
| Laya Vidhyalaya UK Ltd | Education | 2014 |
| Laybridge Limited | Administrative & support | 1997 |
| Layered Sprinkles Ltd | Hospitality | 2022 |
| Layth ALI Limited | Wholesale & retail | 2025 |
| LAZ HD Transport Ltd | Transport & logistics | 2025 |
| Lazar Construct Ltd | Construction | 2020 |
| Lazar House Investment Ltd | Real estate | 2023 |
| LBA Fabrication Limited | Manufacturing | 2016 |
| Lbcc Ltd | Arts & recreation | 2025 |
| Lbuk Group Limited | Construction | 2024 |
| LC Driveways Solutions Ltd | Construction | 2014 |
| LCG Accountancy Ltd | Professional & scientific | 2022 |
| LCH4X4 Ltd | Administrative & support | 2026 |
| LCJ Real Estate Limited | Real estate | 2025 |
| LCL Site Services Ltd | Construction | 2022 |
| LCN Instalation Ltd | Construction | 2024 |
| Lcst Trading Limited | Hospitality | 2008 |
| Lcuk Luton Limited | Other services | 2019 |
| LCY London Ltd | Wholesale & retail | 2021 |
| LDM Global Limited | Wholesale & retail | 2021 |
| LDM Retail Limited | Manufacturing | 2009 |
| Ldremovals Limited | Transport & logistics | 2025 |
| LDS Haulage Ltd | Transport & logistics | 2023 |
| LE Chocolat Fondue Ltd | Hospitality | 2014 |
| LE Front Patriotique Camerounais / Cameroon Patriotic Front Cyfngedig Ltd | Arts & recreation | 2025 |
| LE MON Basements Ltd | Construction | 2019 |
| LE MON Construction Ltd | Construction | 2019 |
| LE MON Plant and Groundworks Ltd | Construction | 2019 |
| LE WIN Heritage Ltd | Real estate | 2026 |
| LEA Bereavement Support Limited | Extraterritorial | 2021 |
| LEA Boxes Limited | Manufacturing | 1913 |
| LEA Property Developments Limited | Real estate | 2016 |